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This allows you to match the ECN bits of the IPv4 and TCP header. ECN is the Explicit Congestion Notification mechanism as specified in RFC3168
This matches if the TCP ECN CWR (Congestion Window Received) bit is set.
This matches if the TCP ECN ECE (ECN Echo) bit is set.
[\fB!\fP] \fB\-\-ecn\-ip\-ect\fP \fInum\fP
This matches a particular IPv4 ECT (ECN-Capable Transport). You have to specify
a number between `0' and `3'.